<!DOCTYPE html>
<html>
  <head>
    <style>
      body {
        background-color: #ffffff;
      }
    </style>
    <title>IOT LAO WANG</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
  </head>
  <body>
    <h1>This is heading 1</h1>
    <h2>This is heading 2</h2>
    <h3>This is heading 3</h3>
    <h4>This is heading 4</h4>
    <h5>This is heading 5</h5>
    <h6>This is heading 6</h6>
    <p>Hello World, hello coder!</p>    
  </body>
</html>